Back color configurable, added fps counter checkbox

Editor/Core/SplashControlPanel.cs

@@ -594,6 +594,10 @@ namespace SplashEdit.EditorCode
                 new GUIContent("Memory Overlay", "Show heap/RAM usage bar at top-right during gameplay"),
                 SplashSettings.MemoryOverlay);
 
+            SplashSettings.FpsOverlay = EditorGUILayout.Toggle(
+                new GUIContent("FPS Overlay", "Show an FPS counter at top-left during gameplay"),
+                SplashSettings.FpsOverlay);
+
             // Serial port (only for Real Hardware)
             if (SplashSettings.Target == BuildTarget.RealHardware)
             {
@@ -1187,6 +1191,9 @@ namespace SplashEdit.EditorCode
 
             if (SplashSettings.MemoryOverlay)
                 buildArg += " MEMOVERLAY=1";
+            
+            if (SplashSettings.FpsOverlay)
+                buildArg += " FPSOVERLAY=1";
 
             int jobCount = Math.Max(1, SystemInfo.processorCount - 1);
             string cleanPrefix = SplashSettings.CleanBuild ? "make clean && " : "";

Editor/Core/SplashSettings.cs

@@ -136,6 +136,19 @@ namespace SplashEdit.EditorCode
             set => EditorPrefs.SetBool(Prefix + "MemoryOverlay", value);
         }
 
+
+        // --- FPS Overlay ---
+        /// <summary>
+        /// When enabled, compiles the runtime with an FPS counter
+        /// and text overlay at the top-left corner of the screen.
+        /// Passes FPSOVERLAY=1 to the native Makefile.
+        /// </summary>
+        public static bool FpsOverlay
+        {
+            get => EditorPrefs.GetBool(Prefix + "FpsOverlay", false);
+            set => EditorPrefs.SetBool(Prefix + "FpsOverlay", value);
+        }
+
         // --- Export settings ---
         public static float DefaultGTEScaling
         {